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| 1 /* | |
| 2 * Copyright (C) 2012 Apple Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * 1. Redistributions of source code must retain the above copyright | |
| 8 * notice, this list of conditions and the following disclaimer. | |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer in the | |
| 11 * documentation and/or other materials provided with the distribution. | |
| 12 * | |
| 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' | |
| 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
| 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS | |
| 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF | |
| 23 * THE POSSIBILITY OF SUCH DAMAGE. | |
| 24 */ | |
| 25 | |
| 26 #ifndef ScrollingConstraints_h | |
| 27 #define ScrollingConstraints_h | |
| 28 | |
| 29 #include "platform/geometry/FloatRect.h" | |
| 30 #include "wtf/Allocator.h" | |
| 31 | |
| 32 namespace blink { | |
| 33 | |
| 34 // ViewportConstraints classes encapsulate data and logic required to reposition
elements whose layout | |
| 35 // depends on the viewport rect (i.e., position fixed), when scrolling and zoomi
ng. | |
| 36 class ViewportConstraints { | |
| 37 STACK_ALLOCATED(); | |
| 38 public: | |
| 39 // FIXME: Simplify this code now that position: sticky doesn't exist. | |
| 40 enum ConstraintType { | |
| 41 FixedPositionConstaint, | |
| 42 }; | |
| 43 | |
| 44 enum AnchorEdgeFlags { | |
| 45 AnchorEdgeLeft = 1 << 0, | |
| 46 AnchorEdgeRight = 1 << 1, | |
| 47 AnchorEdgeTop = 1 << 2, | |
| 48 AnchorEdgeBottom = 1 << 3 | |
| 49 }; | |
| 50 typedef unsigned AnchorEdges; | |
| 51 | |
| 52 ViewportConstraints(const ViewportConstraints& other) | |
| 53 : m_alignmentOffset(other.m_alignmentOffset) | |
| 54 , m_anchorEdges(other.m_anchorEdges) | |
| 55 { } | |
| 56 | |
| 57 virtual ~ViewportConstraints() { } | |
| 58 | |
| 59 virtual ConstraintType constraintType() const = 0; | |
| 60 | |
| 61 AnchorEdges anchorEdges() const { return m_anchorEdges; } | |
| 62 bool hasAnchorEdge(AnchorEdgeFlags flag) const { return m_anchorEdges & flag
; } | |
| 63 void addAnchorEdge(AnchorEdgeFlags edgeFlag) { m_anchorEdges |= edgeFlag; } | |
| 64 void setAnchorEdges(AnchorEdges edges) { m_anchorEdges = edges; } | |
| 65 | |
| 66 FloatSize alignmentOffset() const { return m_alignmentOffset; } | |
| 67 void setAlignmentOffset(const FloatSize& offset) { m_alignmentOffset = offse
t; } | |
| 68 | |
| 69 protected: | |
| 70 ViewportConstraints() | |
| 71 : m_anchorEdges(0) | |
| 72 { } | |
| 73 | |
| 74 FloatSize m_alignmentOffset; | |
| 75 AnchorEdges m_anchorEdges; | |
| 76 }; | |
| 77 | |
| 78 class FixedPositionViewportConstraints final : public ViewportConstraints { | |
| 79 STACK_ALLOCATED(); | |
| 80 public: | |
| 81 FixedPositionViewportConstraints() | |
| 82 : ViewportConstraints() | |
| 83 { } | |
| 84 | |
| 85 FixedPositionViewportConstraints(const FixedPositionViewportConstraints& oth
er) | |
| 86 : ViewportConstraints(other) | |
| 87 , m_viewportRectAtLastLayout(other.m_viewportRectAtLastLayout) | |
| 88 , m_layerPositionAtLastLayout(other.m_layerPositionAtLastLayout) | |
| 89 { } | |
| 90 | |
| 91 FloatPoint layerPositionForViewportRect(const FloatRect& viewportRect) const
; | |
| 92 | |
| 93 const FloatRect& viewportRectAtLastLayout() const { return m_viewportRectAtL
astLayout; } | |
| 94 void setViewportRectAtLastLayout(const FloatRect& rect) { m_viewportRectAtLa
stLayout = rect; } | |
| 95 | |
| 96 const FloatPoint& layerPositionAtLastLayout() const { return m_layerPosition
AtLastLayout; } | |
| 97 void setLayerPositionAtLastLayout(const FloatPoint& point) { m_layerPosition
AtLastLayout = point; } | |
| 98 | |
| 99 bool operator==(const FixedPositionViewportConstraints& other) const | |
| 100 { | |
| 101 return m_alignmentOffset == other.m_alignmentOffset | |
| 102 && m_anchorEdges == other.m_anchorEdges | |
| 103 && m_viewportRectAtLastLayout == other.m_viewportRectAtLastLayout | |
| 104 && m_layerPositionAtLastLayout == other.m_layerPositionAtLastLayout; | |
| 105 } | |
| 106 | |
| 107 bool operator!=(const FixedPositionViewportConstraints& other) const { retur
n !(*this == other); } | |
| 108 | |
| 109 private: | |
| 110 ConstraintType constraintType() const override { return FixedPositionConstai
nt; } | |
| 111 | |
| 112 FloatRect m_viewportRectAtLastLayout; | |
| 113 FloatPoint m_layerPositionAtLastLayout; | |
| 114 }; | |
| 115 | |
| 116 } // namespace blink | |
| 117 | |
| 118 #endif // ScrollingConstraints_h | |
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Chromium Code Reviews
Issue 1308273010:
Adapt and reland old position sticky implementation (Closed)
Base URL: https://chromium.googlesource.com/chromium/blink.git@master